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Summary: Constants | Methods

# Adapter

`public interface Adapter`
``

android.widget.Adapter

Known indirect subclasses ArrayAdapter<T>, BaseAdapter, CursorAdapter, HeaderViewListAdapter, ListAdapter, ResourceCursorAdapter, SimpleAdapter, SimpleCursorAdapter, SpinnerAdapter, ThemedSpinnerAdapter, WrapperListAdapter
ArrayAdapter<T> | You can use this adapter to provide views for an `AdapterView`, Returns a view for each object in a collection of data objects you provide, and can be used with list-based user interface widgets such as `ListView` or `Spinner`.
BaseAdapter | Common base class of common implementation for an `Adapter` that can be used in both `ListView` (by implementing the specialized `ListAdapter` interface) and `Spinner` (by implementing the specialized `SpinnerAdapter` interface).
CursorAdapter | Adapter that exposes data from a `Cursor` to a `ListView` widget.
HeaderViewListAdapter | ListAdapter used when a ListView has header views.
ListAdapter | Extended `Adapter` that is the bridge between a `ListView` and the data that backs the list.
ResourceCursorAdapter | An easy adapter that creates views defined in an XML file.
SimpleAdapter | An easy adapter to map static data to views defined in an XML file.
SimpleCursorAdapter | An easy adapter to map columns from a cursor to TextViews or ImageViews defined in an XML file.
SpinnerAdapter | Extended `Adapter` that is the bridge between a `Spinner` and its data.
ThemedSpinnerAdapter | An extension of SpinnerAdapter that is capable of inflating drop-down views against a different theme than normal views.
WrapperListAdapter | List adapter that wraps another list adapter.

An Adapter object acts as a bridge between an `AdapterView` and the underlying data for that view. The Adapter provides access to the data items. The Adapter is also responsible for making a `View` for each item in the data set.

See also:

- `ArrayAdapter`
- `CursorAdapter`
- `SimpleCursorAdapter`

## Summary

### Constants
`int` | `IGNORE_ITEM_VIEW_TYPE` An item view type that causes the `AdapterView` to ignore the item view.
`int` | `NO_SELECTION`

### Public methods
`default CharSequence[]` | `getAutofillOptions()` Gets a string representation of the adapter data that can help `AutofillService` autofill the view backed by the adapter.
`abstract int` | `getCount()` How many items are in the data set represented by this Adapter.
`abstract Object` | `getItem(int position)` Get the data item associated with the specified position in the data set.
`abstract long` | `getItemId(int position)` Get the row id associated with the specified position in the list.
`abstract int` | `getItemViewType(int position)` Get the type of View that will be created by `getView(int, View, ViewGroup)` for the specified item.
`abstract View` | `getView(int position, View convertView, ViewGroup parent)` Get a View that displays the data at the specified position in the data set.
`abstract int` | `getViewTypeCount()` Returns the number of types of Views that will be created by `getView(int, View, ViewGroup)`.
`abstract boolean` | `hasStableIds()` Indicates whether the item ids are stable across changes to the underlying data.
`abstract boolean` | `isEmpty()`
`abstract void` | `registerDataSetObserver(DataSetObserver observer)` Register an observer that is called when changes happen to the data used by this adapter.
`abstract void` | `unregisterDataSetObserver(DataSetObserver observer)` Unregister an observer that has previously been registered with this adapter via `registerDataSetObserver(DataSetObserver)`.

## Constants

### IGNORE_ITEM_VIEW_TYPE

    public static final int IGNORE_ITEM_VIEW_TYPE

An item view type that causes the `AdapterView` to ignore the item view. For example, this can be used if the client does not want a particular view to be given for conversion in `getView(int, android.view.View, android.view.ViewGroup)`.

See also:

- `getItemViewType(int)`
- `getViewTypeCount()`

Constant Value: -1 (0xffffffff)

### NO_SELECTION

    public static final int NO_SELECTION

Constant Value: -2147483648 (0x80000000)

## Public methods

### getAutofillOptions

    public CharSequence[] getAutofillOptions ()

Gets a string representation of the adapter data that can help `AutofillService` autofill the view backed by the adapter.

It should only be set (i.e., non-`null` if the values do not represent PII (Personally Identifiable Information - sensitive data such as email addresses, credit card numbers, passwords, etc...). For example, it's ok to return a list of month names, but not a list of usernames. A good rule of thumb is that if the adapter data comes from static resources, such data is not PII - see `ViewStructure.setDataIsSensitive(boolean)` for more info.

Returns
`CharSequence[]` | `null` by default, unless implementations override it.

### getCount

    public abstract int getCount ()

How many items are in the data set represented by this Adapter.

Returns
`int` | Count of items.

### getItem

    public abstract Object getItem (int position)

Get the data item associated with the specified position in the data set.

Parameters
`position` | `int`: Position of the item whose data we want within the adapter's data set.

Returns
`Object` | The data at the specified position.

### getItemId

    public abstract long getItemId (int position)

Get the row id associated with the specified position in the list.

Parameters
`position` | `int`: The position of the item within the adapter's data set whose row id we want.

Returns
`long` | The id of the item at the specified position.

### getItemViewType

    public abstract int getItemViewType (int position)

Get the type of View that will be created by `getView(int, View, ViewGroup)` for the specified item.

Parameters
`position` | `int`: The position of the item within the adapter's data set whose view type we want.

Returns
`int` | An integer representing the type of View. Two views should share the same type if one can be converted to the other in `getView(int, View, ViewGroup)`. Note: Integers must be in the range 0 to `getViewTypeCount()` - 1. `IGNORE_ITEM_VIEW_TYPE` can also be returned.

See also:

- `IGNORE_ITEM_VIEW_TYPE`

### getView

    public abstract View getView (int position,
                    View convertView,
                    ViewGroup parent)

Get a View that displays the data at the specified position in the data set. You can either create a View manually or inflate it from an XML layout file. When the View is inflated, the parent View (GridView, ListView...) will apply default layout parameters unless you use `LayoutInflater.inflate(int, android.view.ViewGroup, boolean)` to specify a root view and to prevent attachment to the root.

Parameters
`position` | `int`: The position of the item within the adapter's data set of the item whose view we want.
`convertView` | `View`: The old view to reuse, if possible. Note: You should check that this view is non-null and of an appropriate type before using. If it is not possible to convert this view to display the correct data, this method can create a new view. Heterogeneous lists can specify their number of view types, so that this View is always of the right type (see `getViewTypeCount()` and `getItemViewType(int)`).
`parent` | `ViewGroup`: The parent that this view will eventually be attached to

Returns
`View` | A View corresponding to the data at the specified position.

### getViewTypeCount

    public abstract int getViewTypeCount ()

Returns the number of types of Views that will be created by `getView(int, View, ViewGroup)`. Each type represents a set of views that can be converted in `getView(int, View, ViewGroup)`. If the adapter always returns the same type of View for all items, this method should return 1.

This method will only be called when the adapter is set on the `AdapterView`.

Returns
`int` | The number of types of Views that will be created by this adapter

### hasStableIds

    public abstract boolean hasStableIds ()

Indicates whether the item ids are stable across changes to the underlying data.

Returns
`boolean` | True if the same id always refers to the same object.

### isEmpty

    public abstract boolean isEmpty ()

Returns
`boolean` | true if this adapter doesn't contain any data. This is used to determine whether the empty view should be displayed. A typical implementation will return getCount() == 0 but since getCount() includes the headers and footers, specialized adapters might want a different behavior.

### registerDataSetObserver

    public abstract void registerDataSetObserver (DataSetObserver observer)

Register an observer that is called when changes happen to the data used by this adapter.

Parameters
`observer` | `DataSetObserver`: the object that gets notified when the data set changes.

### unregisterDataSetObserver

    public abstract void unregisterDataSetObserver (DataSetObserver observer)

Unregister an observer that has previously been registered with this adapter via `registerDataSetObserver(DataSetObserver)`.

Parameters
`observer` | `DataSetObserver`: the object to unregister.

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